Vat dye.



. 1 UNITED v STATES PATENT OFFICE.

PAUL 'THOMASOHEW SI ZI, OI VOHWINKEL, NEAR ELIBERFELD, GERMANY, ASSIGNOB '10 FARBENFAIBBIKEN VOBM. FBIEDR. BAYER & 60., OF ELBERFELD, GERMANY, A

' -diehlorodiphenyls,

5 aminoanthr uinone.

- 'lowing gene 993,736. ll'o Drawing.

CORPORATION OF GERMANY.

sxi, doctor of philosophy, chemist, citizen'of -theGerman Em ire, residing at Vohwinkel,

n'ear Elberfeld, ermany, have invented new and. useful Improvements in Vat 'Dye, of

which the following is a specification. .rThe present invention concerns the 'manu- ".facture and production of new vat dyes which can be obtained by condensing polyhalogenated diarylcompounds, especial y dichloro dimethyldiphenyla-with at least two'molecules of an The new es having probably the fol-' ml formula:

in. whichA means an anthraquinone sub- ,..stance and R an atom of'hydrogen which I" may be substituted by alkyl' oups are after bein dried and pulverize dark powders solu le in pyridin'withfrom a bluish-red to'blue to-violet color; soluble in concen .trated sulfuric acid generally with a yellowishto brown'to olivecolor; yielding vats with hydrosulfite and caustic soda lye, dyeing cotton from red to violet to blue to green v .fast shades.-

In order to illustrate the new process more fully. the following example is given, the

- parts being by weight :-A mixture of 2 Ia'nh drous sodium acetate, 0.5

1 Cu 1 and 40 parts. of naphthalene 1s heated to boiling durmg 10 hours until the quantity of the dye does no longer increase. Alcohol 1 is added, the new dye 1s filtered oif from the liquid and washed with alcohol and then with hot water. It is a brown crystalline.

owder soluble in boiling pyridin with a bluish-red color, soluble in concentrated sul furic acid with a yellow color. Upon treatment with hydrosulfite and caustic soda lye an orange-brown vat is obtained which dyes "cotton fast violet.

The dye obtained from 4.4-dibromodiphenyl and 1-monobenzoyl--aminoanthra- .Gopiesgt this Patent may be obtained for Specification of Letters Patent.

Application died September 27,- 1910. Serial 80, 588,986.

VAT DYE.

quinone dyes bluishgreen, that obtained from 4.4'-dichloro-3.3,-dimethyldiphenyl+ 1-amino-2-methyl-anthra uinone d esviolet, that obtained from 3.3'3iichlorod1phenyl-laxionobenzoyl-l.4-diaminoanthraquinone dyes ue. I claim v 1. The hereindescribed new vat dyestufi's obtainable by condensing a dihalogendiaryl compound with an aminoanthraquinone, hanging probably the following general formu a z in which A. means an anthraquinone substance and R an atom of h drogen which may be substituted by alky groups which dyes are after being dried and pulverized dark powders soluble in pyridin with from Patented May 30, 1911.

a bluish-red to blue to violet color; being Y soluble in concentrated sulfuric acid generally with a yellow to brown to olive color;

dyeing cotton from the vat from red to violet to blue to green shades, substantially as described.

2. The herein described new d e obtainable from para-para -dichlorodi enyl and two molecules of l-aminoant ra uinone having probably the following formu a:

nsme which is after being dried and ulverized a brown crystalline owder, solub e in boiling pyridin with a b uish-red color, soluble in concentrated sulfuric acid with a ellow color; dyeing cotton from a hydrosnl te vat fast violet shades, substantially as described. I

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

PAUL THOMASGHEWSKI.

Witnesses: r

CHAS. J. Wmon'r, WALTER VONNEGUT.-

five cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

